Where and how is caffeine exerting its effects

Reference no: EM136551

Q. You are given the isolated skeletal muscle with its motor neuron intact. This preparation is arranged so that you are able to make electrophysiological measurements from the nerve and the muscle as well as mechanical measurements of muscle contraction. You view that if caffeine is added to the fluid bathing the preparation, the peak tension developed in a muscle twitch produced by stimulating the motor nerve is increased.

i. List all probable points at which caffeine may be exerting its effect.

ii. Caffeine is known to alter the transmembrane movement of calcium. What is (are) the possible site(s) at which caffeine is acting?

iii. High concentrations of caffeine cause an isolated muscle to contract in absence of any activity in the motor nerve. This contraction is not blocked by nicotinic antagonists like curare. Where and how is caffeine exerting its effects?

Reference no: EM136551

Questions Cloud

What limits the size of an animal : A form of vitamin D-resistant rickets, known as hypophosphatemia, is inherited as an x-linked dominant trait. If a male with hypophosphatemia, marries a normal female, which predictions concerning their potential progeny would be true.

This series of reaction is called : If you were asked to create a karyotype from the chromosome spreads you made from HeLa cells in Activity 4.2.1, list materials you would use and explain how you would make the karyotype.

How will the procedure result in purification of tubulin : GTP is again added to the redissolved pellet proteins, and the solution is again warmed for a few minutes. Then centrifugation at similar speed described above is again performed. This process is repeated several times.

How is geological energy different from biological energy : How is geological energy different from biological energy. Charlie has the blood test that shows a normal level of LDLs other than an elevated level of HDLs in his blood. Because his family has a history of cardiovascular disease, he wonders if he mu..

Where and how is caffeine exerting its effects : List all probable points at which caffeine may be exerting its effect. Caffeine is known to alter the transmembrane movement of calcium. What is (are) the possible site(s) at which caffeine is acting.

Healthy individuals of paramecium bursaria : Which of these situations would be most positive to the re-establishment of resident zoochlorellae, assume compatible Chlorella are present in P. bursaria's habitat.

Which leaf-eating insects are consumed by fish : Angel is a biologist studying Lake Ecosystem in which leaf-eating insects are consumed by fish, which are consumed by snakes, which are consumed by hawks. In this case, how would you categorize a fish.

What sorts of plants will you select for crossing : What sorts of plants will you select for crossing. Describe how allergies, common cold or influenza change the structures of the respiratory system and cause decrease in gas exchange.

How do biologists interpret these similarities : Barbara McClintock, famous for discovering that genes might move within genomes, had her meticulous work ignored for nearly 4 decades, but eventually won the Nobel Prize. Why was her work so distrusted.

User Account

All Pages